EP3543731A1 - Procédé et système de positionnement, et dispositif associé - Google Patents

Procédé et système de positionnement, et dispositif associé Download PDF

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Publication number
EP3543731A1
EP3543731A1 EP16923947.2A EP16923947A EP3543731A1 EP 3543731 A1 EP3543731 A1 EP 3543731A1 EP 16923947 A EP16923947 A EP 16923947A EP 3543731 A1 EP3543731 A1 EP 3543731A1
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EP
European Patent Office
Prior art keywords
base station
auxiliary
located target
location server
rstd
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16923947.2A
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German (de)
English (en)
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EP3543731A4 (fr
Inventor
Jiantao XUE
Kailong Wang
Anjian Li
Yuan Gao
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Publication of EP3543731A1 publication Critical patent/EP3543731A1/fr
Publication of EP3543731A4 publication Critical patent/EP3543731A4/fr
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/0205—Details
    • G01S5/0236—Assistance data, e.g. base station almanac
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/0284—Relative positioning
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/10—Position of receiver fixed by co-ordinating a plurality of position lines defined by path-difference measurements, e.g. omega or decca systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H04W64/003—Locating users or terminals or network equipment for network management purposes, e.g. mobility management locating network equipment
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S2205/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S2205/001—Transmission of position information to remote stations
    • G01S2205/008—Transmission of position information to remote stations using a mobile telephone network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a locating method, a system, and a related device.
  • the locating service has become an indispensable part of mobile communications and personal communications services, plays an important role in production and life of people, and is faced with diversified requirements.
  • the locating service is a value-added service that is used for obtaining location information (such as longitude and latitude coordinates) of a mobile terminal user by using a mobile communications network of a telecommunications operator and that can provide a corresponding service for the user with support of an electronic map platform.
  • location information such as longitude and latitude coordinates
  • Requirements of users for a locating service show a broad and high-standard development trend. For example, there are locating requirements in many aspects such as security monitoring, disaster emergency response, traffic dispersion, and interactive gaming.
  • a locating algorithm that is used to perform measurement based on a time difference of arrival is a commonly used locating algorithm.
  • Observed time difference of arrival Observed Time Difference Of Arrival, OTDOA
  • uplink time difference of arrival Uplink Time Difference Of Arrival, UTDOA
  • OTDOA Observed Time Difference Of Arrival
  • UTDOA Uplink Time Difference Of Arrival
  • a principle of this locating algorithm is as follows: When there are three or more base stations in a system, a location of user equipment (User Equipment, UE) may be determined based on reference signal time differences (Reference Signal Time Difference, RSTD) of positioning reference signals (Positioning Reference Signal, PRS)/sounding reference signals (Sounding Reference Signal, SRS) transmitted by different base stations in a downlink direction or in an uplink direction.
  • RSTD Reference Signal Time Difference
  • PRS Positioning Reference Signal
  • SRS Sounding Reference Signal
  • Embodiments of the present invention disclose a locating method, a system, and a related device, to improve locating accuracy and flexibility.
  • a first aspect of the embodiments of the present invention discloses a locating method, including:
  • the method before the determining, by a location server based on a preset base station selection rule and a neighboring cell measurement result that is sent by to-be-located target user equipment UE, a base station set participating in locating of the to-be-located target UE, the method further includes:
  • the method further includes:
  • the determining, by a location server based on a preset base station selection rule and a neighboring cell measurement result that is sent by to-be-located target user equipment UE, a base station set participating in locating of the to-be-located target UE is specifically:
  • the determining, by the location server based on a preset auxiliary UE selection rule and an adjacent UE measurement result that is sent by the to-be-located target UE, an auxiliary UE set participating in locating of the to-be-located target UE is specifically:
  • the determining, by the location server, location information of the plurality of to-be-located UEs based on the first RSTD set, the second RSTD set, and location information of base stations included in the base station set is specifically:
  • the performing, by the location server, a plurality of iterations on the combined locating equations of the plurality of to-be-located UEs is specifically: obtaining, by the location server, a location error Cramér-Rao bound, obtained when each iteration starts, of each auxiliary UE included in the auxiliary UE set, and using an auxiliary UE with a minimum location error Cramér-Rao bound to participate in each iteration.
  • a second aspect of the embodiments of the present invention discloses a locating method, including:
  • the method before the sending, by to-be-located target UE, a neighboring cell measurement result and an adjacent UE measurement result to a location server, the method further includes:
  • a third aspect of the embodiments of the present invention discloses a locating method, including:
  • the reference base station is a base station, in the base station set, that serves the to-be-located target UE and whose communication quantity meets a preset condition.
  • a fourth aspect of the embodiments of the present invention discloses a location server, including:
  • the location server further includes a configuration module.
  • the receiving module is further configured to receive a location request sent by the to-be-located target UE.
  • the configuration module is configured to respond to the location request, and configure measurement parameters for performing neighboring cell measurement and adjacent UE measurement by the to-be-located target UE.
  • the receiving module is further configured to receive the neighboring cell measurement result and the adjacent UE measurement result that are obtained by performing neighboring cell measurement and adjacent UE measurement based on the measurement parameters and that are sent by the to-be-located target UE.
  • the location server further includes an obtaining module and a sending module.
  • the obtaining module is configured to obtain a first PRS parameter set of the base station set and a second PRS parameter set of the auxiliary UE set.
  • the sending module is configured to send the first PRS parameter set and the second PRS parameter set to the to-be-located target UE, so that the to-be-located target UE listens for, based on the first PRS parameter set, a PRS sent by each base station included in the base station set, and listens for, based on the second PRS parameter set, a PRS sent through the D2D connection by each auxiliary UE included in the auxiliary UE set.
  • the determining module is specifically configured to:
  • the determining module is specifically configured to:
  • processing module is specifically configured to:
  • the processing module is specifically configured to: obtain a location error Cramér-Rao bound, obtained when each iteration starts, of each auxiliary UE included in the auxiliary UE set, and use an auxiliary UE with a minimum location error Cramér-Rao bound to participate in each iteration.
  • a fifth aspect of the embodiments of the present invention discloses UE, including:
  • the UE further includes a measurement module.
  • the sending module is further configured to send a location request to the location server.
  • the receiving module is further configured to receive measurement parameters that are used for neighboring cell measurement and adjacent UE measurement and that are sent by the location server in response to the location request.
  • the measurement module is configured to perform neighboring cell measurement and adjacent UE measurement based on the measurement parameters, to obtain the neighboring cell measurement result and the adjacent UE measurement result.
  • a sixth aspect of the embodiments of the present invention discloses a base station, including:
  • a seventh aspect of the embodiments of the present invention discloses a locating system, including: the location server according to any implementation of the foregoing fourth aspect, the UE according to any implementation of the foregoing fifth aspect, and the base station according to the foregoing sixth aspect.
  • An eighth aspect of the embodiments of the present invention discloses a location server, including a processor, a transceiver, and a memory, where the processor, the transceiver, and the memory are connected by using a bus, the memory stores executable program code, the transceiver is configured to send and receive messages under control of the processor, and the processor is configured to invoke the executable program code to perform the locating method according to any implementation of the foregoing first aspect.
  • a ninth aspect of the embodiments of the present invention discloses UE, including a processor, a transceiver, and a memory, where the processor, the transceiver, and the memory are connected by using a bus, the memory stores executable program code, the transceiver is configured to send and receive messages under control of the processor, and the processor is configured to invoke the executable program code to perform the locating method according to any implementation of the foregoing second aspect.
  • a tenth aspect of the embodiments of the present invention discloses a base station, including a processor, a transceiver, and a memory, where the processor, the transceiver, and the memory are connected by using a bus, the memory stores executable program code, the transceiver is configured to send and receive messages under control of the processor, and the processor is configured to invoke the executable program code to perform the locating method according to any implementation of the foregoing third aspect.
  • the location server determines, based on the preset base station selection rule and the neighboring cell measurement result of the to-be-located target user equipment UE, the base station set participating in locating of the to-be-located target UE, and determines, based on the preset auxiliary UE selection rule and the adjacent UE measurement result of the to-be-located target UE, the auxiliary UE set participating in locating of the to-be-located target UE, where the to-be-located target UE is any one of the plurality of to-be-located UEs.
  • the location server receives, from the to-be-located target UE, the first RSTD set of positioning reference signals PRSs sent by any two base stations in the base station set to the to-be-located target UE, and the second RSTD set of a PRS sent by any auxiliary UE in the auxiliary UE set to the to-be-located target UE and a PRS sent by a reference base station in the base station set to the to-be-located target UE, and then determines the location information of the plurality of to-be-located UEs based on the first RSTD set, the second RSTD set, and the location information of the base stations included in the base station set. In this way, locating accuracy and flexibility can be improved.
  • the technical solutions of the embodiments of the present invention may be applied to various communications systems, such as a Global System for Mobile Communications (Global System for Mobile communications, GSM), a Code Division Multiple Access (Code Division Multiple Access, CDMA) system, a Wideband Code Division Multiple Access (Wideband Code Division Multiple Access, WCDMA) system, a General Packet Radio Service (General Packet Radio Service, GPRS) system, a Long Term Evolution (Long Term Evolution, LTE) system, an LTE Frequency Division Duplex (Frequency Division Duplex, FDD) system, an LTE Time Division Duplex (Time Division Duplex, TDD) system, a Universal Mobile Telecommunications System (Universal Mobile Telecommunications System, UMTS), or a Worldwide Interoperability for Microwave Access (Worldwide Interoperability for Microwave Access, WIMAX) communications system.
  • GSM Global System for Mobile Communications
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE
  • the UE in the embodiments of the present invention includes a terminal (Terminal), a mobile station (Mobile Station, MS), a mobile terminal (Mobile Terminal), or the like.
  • the UE may be a mobile phone, a computer with a mobile terminal, or the like, and the UE may be alternatively a portable, pocket-sized, handheld, computer built-in, or in-vehicle mobile apparatus.
  • a base station in the embodiments of the present invention includes a macro base station, an LMU, a micro base station, a pico base station, a pico remote radio unit (pico Remote Radio Unit, pRRU) and a remote radio head (Remote Radio Head, RRH) that belong to a same macro base station, a pRRU and an RRH that belong to different macro base stations, or the like, and may specifically include a base station (Base Station, BS) in a GSM or CDMA system, a NodeB (Node B, NB) in a WCDMA system, or an evolved NodeB (Evolutional Node B, eNB) in an LTE system.
  • Base Station BS
  • NodeB Node B
  • eNB evolved NodeB
  • eNB evolved NodeB
  • the LMU is a network element that participates in locating in a UTDOA technology and that receives an SRS sent by UE.
  • the LMU is a logical entity, and may be deployed on a same device as a base station, or may be an independent network element device.
  • a location server in the embodiments of the present invention is in general any logical entity responsible for locating in a system.
  • UTDOA locating and OTDOA locating may be included based on an uplink reference signal (SRS) and a downlink reference signal (PRS) that are used in locating measurement.
  • SRS uplink reference signal
  • PRS downlink reference signal
  • all technologies used for performing measurement based on a time difference of signal arrival to implement locating belong to UTDOA locating or OTODA locating, and the focus is on OTDOA.
  • a device-to-device (Device-to-Device, D2D) technology enables data to be transmitted between adjacent UEs within a short distance in a cell through a direct link, instead of being forwarded by a central node (that is, a base station).
  • D2D and a mobile cellular network system share a licensed frequency band, facilitating centralized interference control and power allocation, and ensuring relatively high communication reliability.
  • FIG. 1a and FIG. 1b are a schematic flowchart of a locating method according to an embodiment of the present invention.
  • the locating method described in this embodiment includes the following steps.
  • To-be-located target UE sends a location request to a location server.
  • the to-be-located target UE is any one of a plurality of to-be-located UEs that send location requests to the location server.
  • the location server responds to the location request, and sends measurement parameters for neighboring cell measurement and adjacent UE measurement to the to-be-located target UE.
  • the location server responds to the location request, configures, for the to-be-located target UE, a measurement parameter for performing neighboring cell measurement and a measurement parameter for performing adjacent UE measurement, and sends the measurement parameters to the to-be-located target UE.
  • the to-be-located target UE receives the measurement parameters, and performs neighboring cell measurement and adjacent UE measurement based on the measurement parameters, to obtain a neighboring cell measurement result and an adjacent UE measurement result.
  • the to-be-located target UE sends the neighboring cell measurement result and the adjacent UE measurement result to the location server.
  • the neighboring cell measurement result includes an adjacent base station list and receive power that is of the to-be-located target UE and that is corresponding to adjacent base stations
  • the adjacent UE measurement result includes an adjacent UE list and receive power that is of the to-be-located target UE and that is corresponding to adjacent UEs.
  • the to-be-located target UE performs neighboring cell measurement and adjacent UE measurement based on the corresponding measurement parameters, and sends the obtained neighboring cell measurement result and adjacent UE measurement result to the location server.
  • the location server determines, based on a preset base station selection rule and the neighboring cell measurement result, a base station set participating in locating of the to-be-located target UE, and determines, based on a preset auxiliary UE selection rule and the adjacent UE measurement result, an auxiliary UE set participating in locating of the to-be-located target UE.
  • a D2D connection is set up between the to-be-located target UE and each auxiliary UE included in the auxiliary UE set.
  • a manner in which the location server determines the base station set participating in locating of the to-be-located target UE may be as follows: The location server obtains the adjacent base station list and the receive power that is of the to-be-located target UE and that is corresponding to the adjacent base stations that are included in the neighboring cell measurement result, selects, from the adjacent base station list, a preset first quantity (for example, two or more than two) of base stations corresponding to relatively large receive power of the to-be-located target UE, and determines the preset first quantity of base stations as the base station set participating in locating of the to-be-located target UE.
  • a preset first quantity for example, two or more than two
  • a manner in which the location server determines the auxiliary UE set participating in locating of the to-be-located target UE may be as follows: The location server obtains the adjacent UE list and the receive power that is of the to-be-located target UE and that is corresponding to the adjacent UEs that are included in the adjacent UE measurement result, selects, from the adjacent UE list, a preset second quantity (for example, one or more than one) of UEs that also send location requests to the location server at the same time or in a same time segment and that are corresponding to relatively large receive power of the to-be-located target UE, and determines the preset second quantity of UEs as the auxiliary UE set participating in locating of the to-be-located target UE.
  • a preset second quantity for example, one or more than one
  • the location server obtains a first PRS parameter set of the base station set and a second PRS parameter set of the auxiliary UE set.
  • each base station included in the base station set reports, to the location server, a PRS parameter for sending a PRS
  • each auxiliary UE included in the auxiliary UE set also reports, to the location server, a PRS parameter for sending a PRS.
  • a base station sends a PRS to the to-be-located target UE to participate in a locating process of the to-be-located target UE
  • auxiliary UE also sends a PRS to the to-be-located target UE through a D2D connection to participate in the locating process of the to-be-located target UE.
  • the location server summarizes the PRS parameters reported by the base stations included in the base station set, as the first PRS parameter set, and summarizes the PRS parameters reported by the auxiliary UEs included in the auxiliary UE set, as the second PRS parameter set.
  • the location server sends the first PRS parameter set and the second PRS parameter set to the to-be-located target UE.
  • the to-be-located target UE listens for, based on the first PRS parameter set, a PRS sent by each base station included in the base station set, and listens for, based on the second PRS parameter set, a PRS sent by each auxiliary UE included in the auxiliary UE set.
  • the location server sends, to the to-be-located target UE, the first PRS parameter set corresponding to the base station set and the second PRS parameter set corresponding to the auxiliary UE set.
  • Each base station included in the base station set sends a PRS to the to-be-located target UE, and sends sending timing information of the PRS.
  • Each auxiliary UE included in the auxiliary UE set also sends a PRS to the to-be-located target UE, and sends sending timing information of the PRS.
  • the to-be-located target UE listens for, based on the first PRS parameter set, the PRS sent by each base station included in the base station set, and listens for, based on the second PRS parameter set, the PRS sent through the D2D connection by each auxiliary UE included in the auxiliary UE set.
  • the to-be-located target UE obtains a first RSTD set of PRSs sent by any two base stations in the base station set to the to-be-located target UE, and obtains a second RSTD set of a PRS sent by any auxiliary UE in the auxiliary UE set to the to-be-located target UE and a PRS sent by a reference base station in the base station set to the to-be-located target UE.
  • the reference base station is a base station, in the base station set, that provides a service for the to-be-located target UE and whose communication quantity meets a preset condition (that is, communication quality is good).
  • the to-be-located target UE obtains, based on the sending timing information of the PRS, a time of arrival (Time of Arrival, TOA) of the PRS sent by each base station included in the base station set to the to-be-located target UE.
  • a time of arrival Time of Arrival, TOA
  • TOA Time of Arrival
  • the to-be-located target UE obtains, based on the sending timing information of the PRS, a TOA of the PRS sent by each auxiliary UE included in the auxiliary UE set to the to-be-located target UE.
  • a TOA of any auxiliary UE By subtracting a TOA of any auxiliary UE from a TOA of the reference base station, an RSTD set (denoted as the second RSTD set) of a PRS sent by any auxiliary UE in the auxiliary UE set to the to-be-located target UE and a PRS sent by the reference base station to the to-be-located target UE may be obtained.
  • the to-be-located target UE sends the first RSTD set and the second RSTD set to the location server.
  • the location server determines location information of the plurality of to-be-located UEs based on the first RSTD set, the second RSTD set, and location information of base stations included in the base station set.
  • a difference between distances from any two base stations included in the base station set to the to-be-located target UE, and a difference between a distance from any auxiliary UE included in the auxiliary UE set to the to-be-located target UE and a distance from the reference base station to the to-be-located target UE may be calculated based on RSTDs.
  • the location server calculates, based on the first RSTD set, the difference between distances from any two base stations included in the base station set to the to-be-located target UE, and the difference between the distance from any auxiliary UE included in the auxiliary UE set to the to-be-located target UE and the distance from the reference base station to the to-be-located target UE.
  • a locating equation for the to-be-located target UE is written by using the distance differences and the location information of the base stations included in the base station set. Then, a corresponding locating equation is also written based on an RSTD set and an RSTD set that are reported by another to-be-located UE in the plurality of to-be-located UEs. In this way, combined locating equations for the plurality of to-be-located UEs may be determined.
  • the location server may use a Gauss-Newton Gauss-Newton iteration method to perform a plurality of iterations on the combined locating equations of the plurality of to-be-located UEs to solve the combined locating equations of the plurality of to-be-located UEs, and determine the location information of the plurality of to-be-located UEs based on solutions of the combined locating equations of the plurality of to-be-located UEs.
  • a Gauss-Newton Gauss-Newton iteration method to perform a plurality of iterations on the combined locating equations of the plurality of to-be-located UEs to solve the combined locating equations of the plurality of to-be-located UEs, and determine the location information of the plurality of to-be-located UEs based on solutions of the combined locating equations of the plurality of to-be-located UEs.
  • the locating equation written for the to-be-located target UE is a hyperbolic equation with locations of two base stations as two focuses or with a location of the reference base station as one focus and a location of auxiliary UE as the other focus.
  • Hyperbolic equations for the plurality of to-be-located UEs are combined to obtain a combined locating hyperbolic equation set for the plurality of to-be-located UEs.
  • the combined locating hyperbolic equation set is solved to obtain a plurality of intersections between hyperbolas. Locations of the plurality of to-be-located UEs may be determined based on the plurality of intersections of the hyperbolas.
  • a UTDOA locating principle is basically the same as an OTDOA locating principle, except that an uplink reference signal SRS is used, UE sends an SRS, and a base station receives the SRS. Details are not described herein again.
  • a base station is labeled by a BS, and UE1, UE2, and UE3 are to-be-located UEs.
  • D2D connections are set up between the UE1, the UE2, and the UE3.
  • the UE1, the UE2, and the UE3 each may communicate with one base station.
  • the UE1 communicates with a BS1
  • the UE2 communicates with a BS2
  • the UE3 communicates with a BS3.
  • TOA UE i UE j represents a true value of a time that it takes for a signal to arrive at the UE j from UE i
  • TOA BS i UE j represents a true value of a time that it takes for a signal to arrive at the UE j from the BS i
  • c represents a speed of light.
  • ⁇ UE i U j represents a measurement error of a distance from the UE i to the UE j
  • ⁇ BS i U j represents a measurement error of a distance from the BS i to the UE j .
  • each to-be-located UE also communicates with other two to-be-located UEs in addition to communicating with a base station. Therefore, there are three communications links connected to each to-be-located UE. Coordinates of to-be-located UE may be obtained by solving the combined locating hyperbolic equation set.
  • each to-be-located UE participates in locating processes of the other to-be-located UEs.
  • Locating information between the to-be-located UEs may be used for mutual verification.
  • coordinates of all to-be-located UEs may be obtained by solving the combined locating hyperbolic equation set based on known coordinates of base stations.
  • a manner for solving the combined locating hyperbolic equation set in this locating scenario may be as follows: A set of coordinates of the UE 1 , the UE 2 , and the UE 3 are found and substituted into equations to obtain a distance difference measurement error ⁇ i , j m corresponding to each equation, to make a quadratic sum of a plurality of ⁇ i , j m closest to 0. ⁇ is a threshold, and is a decimal number approximating 0.
  • i j ) are measured.
  • Coordinates of each point are used as a true value of coordinates of to-be-located UE.
  • Estimated values of coordinates of these points are used (randomly generated values are used as estimated values in an initial iteration, and results of a current iteration are used as estimated values in a next iteration).
  • ⁇ K ⁇ 2,1 1 ⁇ 3,1 1 ⁇ 1,2 2 ⁇ 3,2 2 ⁇ 1,3 1 ⁇ 2,3 1
  • MSD 1 2 ⁇ 2,1 1 2 + ⁇ 3,1 1 2 + ⁇ 1,2 2 2 + ⁇ 3,2 2 2 + ⁇ 1,3 3 2 + ⁇ 2,3 3 2 ⁇ ⁇
  • a Gauss-Newton direction d k is calculated in the k th iteration.
  • a base station is labeled by a BS, and UE1, UE2, and UE3 are to-be-located UEs.
  • D2D connections are set up between the UE1, the UE2, and the UE3.
  • the UE1, the UE2, and the UE3 each may communicate with two base stations.
  • To-be-located UEs are allowed to communicate with each other in a D2D form, so that each to-be-located UE may also communicate with other to-be-located UEs in addition to communicating with two base stations, and there are more than three communications links connected to each to-be-located UE. Therefore, locations of the to-be-located UEs may be determined.
  • a combined locating hyperbolic equation set and a solving method in this locating scenario are similar to those in the locating scenario 1, and details are not described herein again.
  • a base station is labeled by a BS, and UE1, UE2, and UE3 are to-be-located UEs.
  • D2D connections are set up between the UE1, the UE2, and the UE3.
  • the UE1, the UE2, and the UE3 each may communicate with three base stations.
  • the to-be-located UE When each to-be-located UE can communicate with three or more base stations, the to-be-located UE may be located only by using communications links between the to-be-located UE and the base stations. On this basis, if to-be-located UEs are allowed to communicate with each other in a D2D form, a quantity of communications links connected to each to-be-located UE may be increased, and a quantity of effective equations in a combined locating hyperbolic equation set written based on the quantity of communications links is increased, thereby improving locating accuracy for the to-be-located UEs.
  • a combined locating hyperbolic equation set and a solving method in this locating scenario are similar to those in the locating scenario 1, and details are not described herein again.
  • x , y , and z coordinates of the base station are represented as x si , y s i , and z s i , respectively.
  • x , y , and z coordinates of the to-be-located UE are represented as x j , y j , and z j , respectively.
  • the z coordinate of the to-be-located UE is 0 constantly.
  • TOA UE i UE j represents a true value of a time that it takes for a signal to arrive at the UE j from UE i
  • TOA BSiUE j represents a true value of a time that it takes for a signal to arrive at the UE j from the BS i .
  • i j ) is added.
  • TOA UE i UE j ⁇ 0.
  • ⁇ UE i UE j represents a measurement error of a distance from the UE i to the UE j
  • ⁇ BS i UE j represents a measurement error of a distance from the BS i to the UE j .
  • ⁇ UE i UE j ⁇ ⁇ BS m
  • the Gauss-Newton iteration method is used to solve the combined locating hyperbolic equation set that is written.
  • J k ⁇ ⁇ 2,1 M ⁇ ⁇ M , 1 ⁇ ⁇ 1,1 1 M ⁇ ⁇ N , 1 1 M ⁇ ⁇ 1,1 1 M ⁇ ⁇ N , 1 1 M ⁇ ⁇ 2 , N 1 M ⁇ ⁇ M , N 1 ⁇ ⁇ 1 , N 1 M ⁇ ⁇ N , N 1 M ⁇ ⁇ 1 , N 1 M ⁇ ⁇ N , N M ⁇ ⁇ 2,1 / ⁇ x 1 ⁇ ⁇ 2,1 / ⁇ y 1 L ⁇ ⁇ 2,1 / ⁇ x N ⁇ ⁇ 2,1 / ⁇ x N M M M M M ⁇ ⁇ M , 1 / ⁇ x 1 ⁇ ⁇ M , 1 / ⁇ y 1 L ⁇ ⁇ M , 1 / ⁇ x N ⁇ ⁇ M , 1 / ⁇ y 1 L ⁇ ⁇ M , 1 / ⁇ x N ⁇ ⁇ M ,
  • a Gauss-Newton direction d k is calculated in the k th iteration.
  • auxiliary UEs in a process of locating based on a base station in combination with D2D, limited by factors such as locating network load, power limitation, and privacy, in an actual situation, not all to-be-located UEs sending location requests are willing to or have authority to participate in, as auxiliary UEs, a locating process of another to-be-located UE sending a location request. This requires selection of auxiliary UE participating in a locating process of to-be-located UE.
  • Conventional auxiliary UE selection methods based on signal strength, receive power, a time of signal arrival, and the like are limited by measurement of a distance between to-be-selected auxiliary UE and to-be-located UE.
  • a topological structure (or location distribution) of auxiliary UEs also affects locating of to-be-located UE.
  • a Cramér-Rao bound (Cramér-Rao bound, CRB) is a lower performance bound of an unbiased estimator.
  • the Cramér-Rao bound is usually used to evaluate locating performance.
  • the Cramér-Rao bound is used, in a locating process, as a basis for selecting auxiliary UE that participates in the locating process of to-be-located UE sending a location request.
  • the Cramér-Rao bound is calculated by taking inverse of a Fisher matrix (Fisher matrix, FIM).
  • each to-be-located UE sending a location request can receive at least PRSs sent by more than three base stations.
  • a location error Cramér-Rao bound in this iteration, of each to-be-located UE sending a location request is calculated, and to-be-located UE that has a minimum Cramér-Rao bound and that sends a location request is selected as auxiliary UE to participate in locating processes, in this round of iteration, of all other to-be-located UEs sending location requests.
  • An iteration process does not stop until a quantity of iterations reaches the maximum quantity of iterations or a location error is a minimum value ⁇ , and a locating result is obtained.
  • auxiliary UE is selected, based on Cramér-Rao bound calculation, for to-be-located UE sending a location request. Due to comprehensive consideration of a distance and location distribution, this auxiliary UE selection manner is more accurate and appropriate than an existing auxiliary UE selection manner in which only a distance is considered.
  • a larger quantity of base stations or auxiliary UEs sending PRSs to the to-be-located UE indicates a larger quantity of hyperbolic equations written for the to-be-located UE, and more accurate locating of the to-be-located UE.
  • better quality of a signal transferred through each communications link for communicating with the to-be-located UE sending a location request indicates more accurate locating of the to-be-located UE.
  • a base station For each to-be-located UE sending a location request, a base station (for example, a reference base station) allocates an optimal link from all links that may be used for communication between the base station and the to-be-located UE.
  • the optimal link may be specifically a link with a shortest distance, or may be a link with a maximum transmit power. It is ensured that interference between the optimal links allocated to all the to-be-located UEs is not greater than a preset threshold. Then, for each to-be-located UE, the base station calculates communication interference quantity generated by each addition of a D2D communications link for the to-be-located UE.
  • Communication interference quantity includes communication interference quantity caused by an existing communications link to a newly added D2D communications link, and communication interference quantity caused by a newly added D2D communications link to an existing communications link. Therefore, in this implementation, control and coordination can be well performed for an interference problem existing in a locating process, so that the location solution provided in this embodiment of the present invention has more practical application significance.
  • to-be-located UE may be located by using a D2D technology: First, the to-be-located UE sends a specially constructed D2D signal for emergency help to surrounding UE that may perform D2D communication; and when receiving the D2D signal for emergency help, the surrounding UE may voluntarily choose to provide locating support (that is, become cooperating UE in a locating process of the to-be-located UE) for the to-be-located UE.
  • the following three locating support manners may be specifically included:
  • an emergency locating problem can be resolved in a disaster environment, reducing dependence on a base station. Compared with locating that depends solely on a base station, in this implementation, a UE locating problem in a disaster environment when a base station is damaged is better resolved.
  • the to-be-located target UE performs neighboring cell measurement and adjacent UE measurement based on the measurement parameters, obtains the neighboring cell measurement result and the adjacent UE measurement result, and sends the neighboring cell measurement result and the adjacent UE measurement result to the location server.
  • the location server determines, based on the preset base station selection rule and the neighboring cell measurement result, the base station set participating in locating of the to-be-located target UE, determines, based on the preset auxiliary UE selection rule and the adjacent UE measurement result, the auxiliary UE set participating in locating of the to-be-located target UE, and sends the first PRS parameter set of the base station set and the second PRS parameter set of the auxiliary UE set to the to-be-located target UE.
  • the to-be-located target UE listens for, based on the first PRS parameter set, the PRS sent by each base station included in the base station set, listens for, based on the second PRS parameter set, the PRS sent by each auxiliary UE included in the auxiliary UE set, obtains the first RSTD set of PRSs sent by any two base stations in the base station set to the to-be-located target UE, obtains the second RSTD set of a PRS sent by any auxiliary UE in the auxiliary UE set to the to-be-located target UE and a PRS sent by a reference base station in the base station set to the to-be-located target UE, and sends the first RSTD set and the second RSTD set to the location server, so that the location server determines the location information of the plurality of to-be-located UEs based on the first RSTD set, the second RSTD set, and the location information of the base stations included in the base station set.
  • a base station and a D2D technology between UEs are combined for locating, so that to-be-located UEs are allowed to exchange locating information, and the locating information is used for mutual verification, increasing information quantity of a combined locating hyperbolic equation set, and helping to improve locating accuracy.
  • locating can also be completed accurately, thereby improving locating flexibility and universality.
  • FIG. 3 is a schematic structural diagram of a location server according to an embodiment of the present invention.
  • the location server described in this embodiment includes:
  • the location server further includes a configuration module 304.
  • the receiving module 302 is further configured to receive a location request sent by the to-be-located target UE.
  • the configuration module 304 is configured to respond to the location request, and configure measurement parameters for performing neighboring cell measurement and adjacent UE measurement by the to-be-located target UE.
  • the receiving module 302 is further configured to receive the neighboring cell measurement result and the adjacent UE measurement result that are obtained by performing neighboring cell measurement and adjacent UE measurement based on the measurement parameters and that are sent by the to-be-located target UE.
  • the location server further includes an obtaining module 305 and a sending module 306.
  • the obtaining module 305 is configured to obtain a first PRS parameter set of the base station set and a second PRS parameter set of the auxiliary UE set.
  • the sending module 306 is configured to send the first PRS parameter set and the second PRS parameter set to the to-be-located target UE, so that the to-be-located target UE listens for, based on the first PRS parameter set, a PRS sent by each base station included in the base station set, and listens for, based on the second PRS parameter set, a PRS sent through the D2D connection by each auxiliary UE included in the auxiliary UE set.
  • the determining module 301 is specifically configured to:
  • the determining module 301 is specifically configured to:
  • the processing module 303 is specifically configured to:
  • the processing module 303 is specifically configured to: obtain a location error Cramér-Rao bound, obtained when each iteration starts, of each auxiliary UE included in the auxiliary UE set, and use an auxiliary UE with a minimum location error Cramér-Rao bound to participate in each iteration.
  • the location server determines, based on the preset base station selection rule and the neighboring cell measurement result of the to-be-located target user equipment UE, the base station set participating in locating of the to-be-located target UE, and determines, based on the preset auxiliary UE selection rule and the adjacent UE measurement result of the to-be-located target UE, the auxiliary UE set participating in locating of the to-be-located target UE, where the to-be-located target UE is any one of the plurality of to-be-located UEs.
  • the location server receives, from the to-be-located target UE, the first RSTD set of positioning reference signals PRSs sent by any two base stations in the base station set to the to-be-located target UE, and the second RSTD set of a PRS sent by any auxiliary UE in the auxiliary UE set to the to-be-located target UE and a PRS sent by a reference base station in the base station set to the to-be-located target UE, and then determines the location information of the plurality of to-be-located UEs based on the first RSTD set, the second RSTD set, and the location information of the base stations included in the base station set.
  • a base station and a D2D technology between UEs are combined for locating, so that to-be-located UEs are allowed to exchange locating information, and the locating information is used for mutual verification, increasing information quantity of a combined locating hyperbolic equation set, and helping to improve locating accuracy.
  • locating can also be completed accurately, thereby improving locating flexibility and universality.
  • FIG. 4 is a schematic structural diagram of UE according to an embodiment of the present invention.
  • the UE described in this embodiment includes:
  • the sending module 401 is further configured to send the first RSTD set and the second RSTD set to the location server, so that the location server determines location information of the plurality of to-be-located UEs based on the first RSTD set, the second RSTD set, and location information of base stations included in the base station set.
  • the UE further includes a measurement module 405.
  • the sending module 401 is further configured to send a location request to the location server.
  • the receiving module 402 is further configured to receive measurement parameters that are used for neighboring cell measurement and adjacent UE measurement and that are sent by the location server in response to the location request.
  • the measurement module 405 is configured to perform neighboring cell measurement and adjacent UE measurement based on the measurement parameters, to obtain the neighboring cell measurement result and the adjacent UE measurement result.
  • any UE of the plurality of to-be-located UEs sends a neighboring cell measurement result and an adjacent UE measurement result to the location server, receives the first PRS parameter set of the base station set and the second PRS parameter set of the auxiliary UE set that are sent by the location server, listens for, based on the first PRS parameter set, the PRS sent by each base station included in the base station set, listens for, based on the second PRS parameter set, the PRS sent through the D2D connection by each auxiliary UE included in the auxiliary UE set, then obtains the first RSTD set of PRSs sent by any two base stations in the base station set to the UE, obtains the second RSTD set of a PRS sent by any auxiliary UE in the auxiliary UE set to the UE through the D2D connection and a PRS sent by a reference base station in the base station set to the UE, and sends the first RSTD set and the second RSTD set to the
  • a base station and a D2D technology between UEs are combined for locating, so that to-be-located UEs are allowed to exchange locating information, and the locating information is used for mutual verification, increasing information quantity of a combined locating hyperbolic equation set, and helping to improve locating accuracy.
  • locating can also be completed accurately, thereby improving locating flexibility and universality.
  • FIG. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • the base station described in this embodiment includes:
  • the sending module 502 is further configured to send a PRS to the to-be-located target UE, so that the to-be-located target UE listens for the PRS based on the PRS parameter set, and sends, to the location server, a first RSTD set of PRSs sent by any two base stations in the base station set to the to-be-located target UE, and a second RSTD set of a PRS sent by any auxiliary UE in an auxiliary UE set to the to-be-located target UE and a PRS sent by a reference base station in the base station set to the to-be-located target UE, so that the location server determines location information of the plurality of to-be-located UEs based on the first RSTD set, the second RSTD set, and location information of base stations included in the base station set.
  • any base station of the base station set determined by the location server sends a PRS parameter of a PRS to to-be-located target UE, where the to-be-located target UE is any one of the plurality of to-be-located UEs.
  • the base station sends the PRS parameter to the location server, so that the location server sends a PRS parameter set to the to-be-located target UE; and then sends a PRS to the to-be-located target UE, so that the to-be-located target UE listens for the PRS based on the PRS parameter set, and sends, to the location server, the first RSTD set of PRSs sent by any two base stations in the base station set to the to-be-located target UE, and the second RSTD set of a PRS sent by any auxiliary UE in the auxiliary UE set to the to-be-located target UE and a PRS sent by a reference base station in the base station set to the to-be-located target UE, so that the location server determines the location information of the plurality of to-be-located UEs based on the first RSTD set, the second RSTD set, and the location information of the base stations included in the base station set.
  • a base station and a D2D technology between UEs are combined for locating, so that to-be-located UEs are allowed to exchange locating information, and the locating information is used for mutual verification, increasing information quantity of a combined locating hyperbolic equation set, and helping to improve locating accuracy.
  • locating can also be completed accurately, thereby improving locating flexibility and universality.
  • FIG. 6 is a schematic structural diagram of another location server according to an embodiment of the present invention.
  • the location server described in this embodiment includes a transceiver 601, a processor 602, and a memory 603.
  • the processor 602 is connected to the transceiver 601 and the memory 603 by using a bus.
  • the transceiver 601 may be specifically a radio frequency receiver or a radio frequency chip, and is configured to send and receive signals.
  • the transceiver 601 may include a transmitter (Transmitter, TX) and a receiver (Receiver, RX) that are integrated.
  • the processor 602 may be specifically a baseband processor, a baseband chip, a digital signal processor (Digital Signal Processor, DSP), a system on chip (SOC) that includes a baseband processor and an application processor, or the like.
  • DSP Digital Signal Processor
  • SOC system on chip
  • the memory 603 is configured to store a set of program code.
  • the processor 602 is configured to invoke the program code stored in the memory 603 to perform the following operations.
  • the processor 602 is configured to determine, based on a preset base station selection rule and a neighboring cell measurement result that is sent by to-be-located target user equipment UE, a base station set participating in locating of the to-be-located target UE, where the to-be-located target UE is any one of a plurality of to-be-located UEs.
  • the processor 602 is further configured to determine, based on a preset auxiliary UE selection rule and an adjacent UE measurement result that is sent by the to-be-located target UE, an auxiliary UE set participating in locating of the to-be-located target UE, where a device-to-device D2D connection is set up between the to-be-located target UE and each auxiliary UE included in the auxiliary UE set.
  • the transceiver 601 is configured to receive a first reference signal time difference RSTD set and a second RSTD set that are sent by the to-be-located target UE, where the first RSTD set is an RSTD set of positioning reference signals PRSs sent by any two base stations in the base station set to the to-be-located target UE, and the second RSTD set is an RSTD set of a PRS sent by any auxiliary UE in the auxiliary UE set to the to-be-located target UE through the D2D connection and a PRS sent by a reference base station in the base station set to the to-be-located target UE.
  • the first RSTD set is an RSTD set of positioning reference signals PRSs sent by any two base stations in the base station set to the to-be-located target UE
  • the second RSTD set is an RSTD set of a PRS sent by any auxiliary UE in the auxiliary UE set to the to-be-located target UE through
  • the processor 602 is further configured to determine location information of the plurality of to-be-located UEs based on the first RSTD set, the second RSTD set, and location information of base stations included in the base station set.
  • the transceiver 601 is further configured to receive a location request sent by the to-be-located target UE.
  • the processor 602 is further configured to respond to the location request, and configure measurement parameters for performing neighboring cell measurement and adjacent UE measurement by the to-be-located target UE.
  • the transceiver 601 is further configured to receive the neighboring cell measurement result and the adjacent UE measurement result that are obtained by performing neighboring cell measurement and adjacent UE measurement based on the measurement parameters and that are sent by the to-be-located target UE.
  • the processor 602 is further configured to obtain a first PRS parameter set of the base station set and a second PRS parameter set of the auxiliary UE set.
  • the transceiver 601 is further configured to send the first PRS parameter set and the second PRS parameter set to the to-be-located target UE, so that the to-be-located target UE listens for, based on the first PRS parameter set, a PRS sent by each base station included in the base station set, and listens for, based on the second PRS parameter set, a PRS sent through the D2D connection by each auxiliary UE included in the auxiliary UE set.
  • the processor 602 is specifically configured to:
  • the processor 602 is specifically configured to:
  • the processor 602 is specifically configured to:
  • the processor 602 is specifically configured to: obtain a location error Cramér-Rao bound, obtained when each iteration starts, of each auxiliary UE included in the auxiliary UE set, and use an auxiliary UE with a minimum location error Cramér-Rao bound to participate in each iteration.
  • the transceiver 601, the processor 602, and the memory 603 described in this embodiment of the present invention may perform an implementation described in a locating method provided in the embodiments of the present invention, or may perform an implementation of a location server provided in the embodiments of the present invention. Details are not described herein again.
  • the location server determines, based on the preset base station selection rule and the neighboring cell measurement result of the to-be-located target user equipment UE, the base station set participating in locating of the to-be-located target UE, and determines, based on the preset auxiliary UE selection rule and the adjacent UE measurement result of the to-be-located target UE, the auxiliary UE set participating in locating of the to-be-located target UE, where the to-be-located target UE is any one of the plurality of to-be-located UEs.
  • the location server receives, from the to-be-located target UE, the first RSTD set of positioning reference signals PRSs sent by any two base stations in the base station set to the to-be-located target UE, and the second RSTD set of a PRS sent by any auxiliary UE in the auxiliary UE set to the to-be-located target UE and a PRS sent by a reference base station in the base station set to the to-be-located target UE, and then determines the location information of the plurality of to-be-located UEs based on the first RSTD set, the second RSTD set, and the location information of the base stations included in the base station set.
  • a base station and a D2D technology between UEs are combined for locating, so that to-be-located UEs are allowed to exchange locating information, and the locating information is used for mutual verification, increasing information quantity of a combined locating hyperbolic equation set, and helping to improve locating accuracy.
  • locating can also be completed accurately, thereby improving locating flexibility and universality.
  • FIG. 7 is a schematic structural diagram of another UE according to an embodiment of the present invention.
  • the UE described in this embodiment includes a transceiver 701, a processor 702, a memory 703, an output device 704, and an input device 705.
  • the processor 702 is connected to the transceiver 701, the memory 703, the output device 704, and the input device 705 by using a bus.
  • the transceiver 701 may be specifically a radio frequency receiver or a radio frequency chip, and is configured to send and receive signals. Specifically, the transceiver 701 may include a transmitter and a receiver that are integrated.
  • the processor 702 may be specifically a baseband processor, a baseband chip, a DSP, an SOC, or the like.
  • the memory 703 is a memory device of the UE, and is configured to store a program or data. It can be understood that the memory 703 herein may be a high-speed RAM memory, or may be a non-volatile memory (non-volatile memory), for example, at least one disk memory. Optionally, the memory 703 may be at least one storage device far away from the processor 702.
  • the output device 704 may include a display.
  • the input device 705 may be a touch panel, a microphone, a camera, or the like.
  • the touch panel includes a touchscreen, a touch control screen, and the like.
  • the memory 703 is configured to store a set of program code.
  • the processor 702 invokes the program code stored in the memory 703 to perform the following operations.
  • the transceiver 701 is configured to send a neighboring cell measurement result and an adjacent UE measurement result to a location server, where the UE is any one of a plurality of to-be-located UEs.
  • the transceiver 701 is further configured to receive a first PRS parameter set of a base station set and a second PRS parameter set of an auxiliary UE set that are sent by the location server, where the base station set is determined by the location server based on a preset base station selection rule and the neighboring cell measurement result, the auxiliary UE set is determined by the location server based on a preset auxiliary UE selection rule and the adjacent UE measurement result, and a D2D connection is set up between the UE and each auxiliary UE included in the auxiliary UE set.
  • the processor 702 is configured to listen for, based on the first PRS parameter set, a PRS sent by each base station included in the base station set, and listen for, based on the second PRS parameter set, a PRS sent through the D2D connection by each auxiliary UE included in the auxiliary UE set.
  • the processor 702 is further configured to obtain a first RSTD set of PRSs sent by any two base stations in the base station set to the UE, and obtain a second RSTD set of a PRS sent by any auxiliary UE in the auxiliary UE set to the UE through the D2D connection and a PRS sent by a reference base station in the base station set to the UE.
  • the transceiver 701 is further configured to send the first RSTD set and the second RSTD set to the location server, so that the location server determines location information of the plurality of to-be-located UEs based on the first RSTD set, the second RSTD set, and location information of base stations included in the base station set.
  • the transceiver 701 is further configured to send a location request to the location server.
  • the transceiver 701 is further configured to receive measurement parameters that are used for neighboring cell measurement and adjacent UE measurement and that are sent by the location server in response to the location request.
  • the processor 702 is further configured to perform neighboring cell measurement and adjacent UE measurement based on the measurement parameters, to obtain the neighboring cell measurement result and the adjacent UE measurement result.
  • the transceiver 701, the processor 702, the memory 703, the output device 704, and the input device 705 described in this embodiment of the present invention may perform an implementation described in a locating method provided in the embodiments of the present invention, or may perform an implementation of UE provided in the embodiments of the present invention. Details are not described herein again.
  • any UE of the plurality of to-be-located UEs sends a neighboring cell measurement result and an adjacent UE measurement result to the location server, receives the first PRS parameter set of the base station set and the second PRS parameter set of the auxiliary UE set that are sent by the location server, listens for, based on the first PRS parameter set, the PRS sent by each base station included in the base station set, listens for, based on the second PRS parameter set, the PRS sent through the D2D connection by each auxiliary UE included in the auxiliary UE set, then obtains the first RSTD set of PRSs sent by any two base stations in the base station set to the UE, obtains the second RSTD set of a PRS sent by any auxiliary UE in the auxiliary UE set to the UE through the D2D connection and a PRS sent by a reference base station in the base station set to the UE, and sends the first RSTD set and the second RSTD set to the
  • a base station and a D2D technology between UEs are combined for locating, so that to-be-located UEs are allowed to exchange locating information, and the locating information is used for mutual verification, increasing information quantity of a combined locating hyperbolic equation set, and helping to improve locating accuracy.
  • locating can also be completed accurately, thereby improving locating flexibility and universality.
  • FIG. 8 is a schematic structural diagram of another base station according to an embodiment of the present invention.
  • the base station described in this embodiment includes a transceiver 801, a processor 802, and a memory 803.
  • the processor 802 is connected to the transceiver 801 and the memory 803 by using a bus.
  • the transceiver 801 may be specifically a radio frequency receiver or a radio frequency chip, and is configured to send and receive signals. Specifically, the transceiver 801 may include a transmitter and a receiver that are integrated.
  • the processor 802 may be specifically a baseband processor, a baseband chip, a DSP, an SOC, or the like.
  • the memory 803 is configured to store a set of program code.
  • the processor 802 invokes the program code stored in the memory 803 to perform the following operations.
  • the processor 802 is configured to determine a PRS parameter for sending a PRS to to-be-located target UE, where the base station is any one of a base station set determined by a location server, and the to-be-located target UE is any one of a plurality of to-be-located UEs.
  • the transceiver 801 is configured to send the PRS parameter to the location server, so that the location server sends a PRS parameter set to the to-be-located target UE.
  • the transceiver 801 is further configured to send a PRS to the to-be-located target UE, so that the to-be-located target UE listens for the PRS based on the PRS parameter set, and sends, to the location server, a first RSTD set of PRSs sent by any two base stations in the base station set to the to-be-located target UE, and a second RSTD set of a PRS sent by any auxiliary UE in an auxiliary UE set to the to-be-located target UE and a PRS sent by a reference base station in the base station set to the to-be-located target UE, so that the location server determines location information of the plurality of to-be-located UEs based on the first RSTD set, the second RSTD set, and location information of base stations included in the base station set.
  • the transceiver 801, the processor 802, and the memory 803 described in this embodiment of the present invention may perform an implementation described in a locating method provided in the embodiments of the present invention, or may perform an implementation of a base station provided in the embodiments of the present invention. Details are not described herein again.
  • any base station of the base station set determined by the location server sends a PRS parameter of a PRS to to-be-located target UE, where the to-be-located target UE is any one of the plurality of to-be-located UEs.
  • the base station sends the PRS parameter to the location server, so that the location server sends a PRS parameter set to the to-be-located target UE; and then sends a PRS to the to-be-located target UE, so that the to-be-located target UE listens for the PRS based on the PRS parameter set, and sends, to the location server, the first RSTD set of PRSs sent by any two base stations in the base station set to the to-be-located target UE, and the second RSTD set of a PRS sent by any auxiliary UE in the auxiliary UE set to the to-be-located target UE and a PRS sent by a reference base station in the base station set to the to-be-located target UE, so that the location server determines the location information of the plurality of to-be-located UEs based on the first RSTD set, the second RSTD set, and the location information of the base stations included in the base station set.
  • a base station and a D2D technology between UEs are combined for locating, so that to-be-located UEs are allowed to exchange locating information, and the locating information is used for mutual verification, increasing information quantity of a combined locating hyperbolic equation set, and helping to improve locating accuracy.
  • locating can also be completed accurately, thereby improving locating flexibility and universality.
  • FIG. 9 is a schematic structural diagram of a locating system according to an embodiment of the present invention.
  • the locating system described in this embodiment includes to-be-located target UE 901, a location server 902, a base station set 903, and an auxiliary UE set 904.
  • the to-be-located target UE 901 is configured to send a location request to the location server 902.
  • the to-be-located target UE 901 is any one of a plurality of to-be-located UEs.
  • the location server 902 is configured to respond to the location request, and send measurement parameters for neighboring cell measurement and adjacent UE measurement to the to-be-located target UE 901.
  • the to-be-located target UE 901 is further configured to receive the measurement parameters, and perform neighboring cell measurement and adjacent UE measurement based on the measurement parameters, to obtain a neighboring cell measurement result and an adjacent UE measurement result.
  • the to-be-located target UE 901 is further configured to send the neighboring cell measurement result and the adjacent UE measurement result to the location server 902.
  • the location server 902 is further configured to determine, based on a preset base station selection rule and the neighboring cell measurement result, a base station set 903 participating in locating of the to-be-located target UE 901, and determine, based on a preset auxiliary UE selection rule and the adjacent UE measurement result, an auxiliary UE set 904 participating in locating of the to-be-located target UE 901.
  • the location server 902 is further configured to obtain a first PRS parameter set of the base station set 903 and a second PRS parameter set of the auxiliary UE set 904.
  • the location server 902 is further configured to send the first PRS parameter set and the second PRS parameter set to the to-be-located target UE 901.
  • the to-be-located target UE 901 is further configured to listen for, based on the first PRS parameter set, a PRS sent by each base station included in the base station set 903, and listen for, based on the second PRS parameter set, a PRS sent by each auxiliary UE included in the auxiliary UE set 904.
  • the to-be-located target UE 901 is further configured to obtain a first RSTD set of PRSs sent by any two base stations in the base station set 903 to the to-be-located target UE, and obtain a second RSTD set of a PRS sent by any auxiliary UE in the auxiliary UE set 904 to the to-be-located target UE and a PRS sent by a reference base station in the base station set to the to-be-located target UE.
  • the reference base station is a base station, in the base station set, that serves the to-be-located target UE and whose communication quantity meets a preset condition.
  • the to-be-located target UE 901 is further configured to send the first RSTD set and the second RSTD set to the location server 902.
  • the location server 902 is further configured to determine location information of the plurality of to-be-located UEs based on the first RSTD set, the second RSTD set, and location information of base stations included in the base station set 903.
  • the to-be-located target UE performs neighboring cell measurement and adjacent UE measurement based on the measurement parameters, obtains the neighboring cell measurement result and the adjacent UE measurement result, and sends the neighboring cell measurement result and the adjacent UE measurement result to the location server.
  • the location server determines, based on the preset base station selection rule and the neighboring cell measurement result, the base station set participating in locating of the to-be-located target UE, determines, based on the preset auxiliary UE selection rule and the adjacent UE measurement result, the auxiliary UE set participating in locating of the to-be-located target UE, and sends the first PRS parameter set of the base station set and the second PRS parameter set of the auxiliary UE set to the to-be-located target UE.
  • the to-be-located target UE listens for, based on the first PRS parameter set, the PRS sent by each base station included in the base station set, listens for, based on the second PRS parameter set, the PRS sent by each auxiliary UE included in the auxiliary UE set, obtains the first RSTD set of PRSs sent by any two base stations in the base station set to the to-be-located target UE, obtains the second RSTD set of a PRS sent by any auxiliary UE in the auxiliary UE set to the to-be-located target UE and a PRS sent by a reference base station in the base station set to the to-be-located target UE, and sends the first RSTD set and the second RSTD set to the location server, so that the location server determines the location information of the plurality of to-be-located UEs based on the first RSTD set, the second RSTD set, and the location information of the base stations included in the base station set.
  • a base station and a D2D technology between UEs are combined for locating, so that to-be-located UEs are allowed to exchange locating information, and the locating information is used for mutual verification, increasing information quantity of a combined locating hyperbolic equation set, and helping to improve locating accuracy.
  • locating can also be completed accurately, thereby improving locating flexibility and universality.
  • the program may be stored in a computer readable storage medium.
  • the storage medium may include a flash memory, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk, an optical disk, or the like.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)
EP16923947.2A 2016-12-14 2016-12-14 Procédé et système de positionnement, et dispositif associé Withdrawn EP3543731A4 (fr)

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KR20190092548A (ko) 2019-08-07
US20190297673A1 (en) 2019-09-26
CN110036307A (zh) 2019-07-19
EP3543731A4 (fr) 2019-12-18
US10813170B2 (en) 2020-10-20

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